Dell Latitude E5420 (Early 2011) - Manual (Page 35)

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Wireless Local Area Network (WLAN) Card
Removing the Wireless Local Area Network (WLAN) Card
1. Follow the procedures in Before Working On Your Computer .
2. Remove the battery .
3. Remove the back panel .
4. Disconnect the antenna cables from the WLAN card.
5. Remove the screw that secures the WLAN card to system board.
6. Remove the WLAN card.
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